mathan_vel

 Profile Answers by mathan_vel Questions by mathan_vel

• Feb 24th, 2009

 

Test Item tree is a data analytical method which allows constructing a hierarchical structure on the items of a questionnaire or test from observed response patterns.

Assume that we have a questionnaire with m items(see below q1,q2,q3, etc..) and that subjects can answer positive (1) or negative (0) to each of these items, i.e. the items are dichotomous. If n subjects answer the items this results in a binary data matrix D with m columns and n rows. Typical examples of this data format are test items which can be solved n(1 )or failed n(2) by subjects. Other typical examples are questionnaires where the items are statements to which subjects can agree (1) or disagree (0).
The goal of an Test Item Tree is to uncover such deterministic implications from the data set.

m	n(1)	n(2)
q1	a	b
q2	a	b
q3	a	b

 

kurtz182

 Profile Answers by kurtz182 Questions by kurtz182

• Dec 5th, 2009

 

A 'Test Item Tree' helps identify risks.  It is the very first step in a specific risk analysis process and I understand it can be used to develop risk strategies for test plans. Admittedly, this is the extent of my knowledge. I have never used a 'Test Item Tree' myself, nor do I find useful information about it on the internet.